package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * 消费者
 */
public class ConsumerQuickStart {

    public static void main(String[] args) {
        //kafka的配置信息
        Properties properties = new Properties();
        //链接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.200.130:9092");
        //反序列化
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        //设置手动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG,false);

        //设置消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"group2");

        //创建消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(properties);
        //订阅主题
        consumer.subscribe(Collections.singletonList("itcast-topic-out"));
        //同步结合异步提交偏移量


        try {
            //拉取消息
            while (true){
                ConsumerRecords<String, String> poll = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> stringStringConsumerRecord : poll) {
                    System.out.println(stringStringConsumerRecord.key());
                    System.out.println(stringStringConsumerRecord.value());
                    System.out.println(stringStringConsumerRecord.offset());


    //                try {
    //                    //同步提交偏移量
    //                    consumer.commitSync();
    //                } catch (CommitFailedException e) {
    //                    System.out.println("记录提交失败的异常"+e);
    //
    //                }
                }
    //            //异步提交偏移量
    //            consumer.commitAsync(new OffsetCommitCallback() {
    //                @Override
    //                public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
    //                    if (e!=null){
    //                        System.out.println("记录错误的提交偏移量"+map+"异常信息为"+e);
    //                    }
    //                }
    //            });
                consumer.commitAsync();
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("记录错误信息"+e);
        }finally {
            //同步提交
            consumer.commitSync();
        }

    }

}
